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For Training Purposes Only Sept 04 4-i P I LOT T R A I N I N G GU I D E AUXILIARY POWER UNIT Chapter 4: Auxiliary Power Unit TABLE OF CONTENTS Page Introduction .........................................................................................................................4-1 Description ..........................................................................................................................4-2 APU Location and Access.............................................................................................4-2 APU Compartment ........................................................................................................4-2 APU Engine...................................................................................................................4-3 System Schematic ........................................................................................................4-4 Lubrication System........................................................................................................4-4 Oil Pressure ............................................................................................................4-5 Oil Replenishment System......................................................................................4-5 Oil Replenishment System Filling ...........................................................................4-7 Oil Replenishment Panel.........................................................................................4-8 Operation ................................................................................................................4-8 Gravity Oil Fill..........................................................................................................4-9 Fuel Control and Indication ...........................................................................................4-9 Airframe Fuel...........................................................................................................4-9 Ignition................................................................................................................... 4-11 Start System.......................................................................................................... 4-11 Speed Indication ................................................................................................... 4-11 Temperature Indication ......................................................................................... 4-11 Hourmeter/Cycle Counter ..................................................................................... 4-12 FADEC Component Control Schematic ...................................................................... 4-12 Control System...................................................................................................... 4-12 Pneumatic ............................................................................................................. 4-13 APU Control Panel ...................................................................................................... 4-14 Start Sequence ........................................................................................................... 4-14 APU Door Positioning ........................................................................................... 4-15 Door Operation...................................................................................................... 4-15 EICAS Display............................................................................................................. 4-15 Door Indication ...................................................................................................... 4-15 APU Fire Protection .................................................................................................... 4-16 APU Loading ......................................................................................................... 4-17 APU Shutdown...................................................................................................... 4-17 APU RPM and EGT Indications .................................................................................. 4-18 Emergency Shutdown................................................................................................. 4-18 External Services Panel .............................................................................................. 4-19 Restart After Emergency Shutdown............................................................................ 4-19 Protective Shutdowns ................................................................................................. 4-20 System Overview Schematic ...................................................................................... 4-21 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：Bombardier global AUXILIARY POWER UNIT
